C6 Base model Corvettes were produced between 2005-2013. Models included the C6 Base, Z51 & Grand Sport (replaced the Z51 in 2009). Prior to 2008 base model Corvettes had a basic exhaust like every other car. In 2008 Chevrolet took the learnings from the C6 Z06 and applied it to base model cars in the form of an optional dual mode exhaust package called the NPP Performance Exhaust. This system featured butterfly valves in the exhaust and perforated tips for comfortable cruising notes and a louder more aggressive tone over about 3500 rpm’s. In the base model C6 NPP mufflers were 2.5″ in diameter vs 3″ in the Z06. In 2009 the over axle exhaust pipe design was changed in base model C6’s, so aftermarket exhaust systems had to adjust the design of their systems for 2009 and newer C6 models (non-Z06/ZR1 models).
If you want to maintain dual-mode functionality on an npp equipped based C6 or grand sport, Billy Boat Fusions have a similar butterfly exhaust design as the factory, but with a design that produces more sound volume and a deeper tone. All other base model C6 Corvette exhaust systems do not offer a butterfly valve in the mufflers to control sound volume and drone. They rely on engineering and sound manipulation principles to adjust the tone without using valves. These traditional style exhaust systems are usually lighter than dual-mode exhausts for even more performance.
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Bassani Pro Cat-Back Exhaust for 2005-2010 C6 Corvette C6CMS5